cfd3549a53
Remove an obsolete comment that refers to code removed by commit 79c6e4c4. The code and comment related to space consumed by guard pages in user-space stacks, which we no longer take into account. Signed-off-by: Ned Bass <bass6@llnl.gov> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #2722